window.onload = () => {
  let itemsDOM = document.getElementById('items'),
      submitBtn = document.getElementById('submit');
  submitBtn.onclick = (e) => {
    let item = document.getElementById('item');
    fetch('http://192.168.8.144:8080/todo',
        {method: 'POST', body: 'item='+item.value})
    .then(res => { res.text().then(txt => console.log(txt))  });
  }
  fetch('http://192.168.8.144:8080/todo')
  .then(res => { 
    res.text().then(txt => {
      let items = JSON.parse(txt).data;
      itemsDOM.innerHTML = items.map(item => '<li>' + item + '</li>').join('\n');
      
    }); 
  }); 
};
